US7981476B2 - Apparatus for coating outer peripheral surface of pillar structure and method for coating outer peripheral surface of pillar structure - Google Patents

Apparatus for coating outer peripheral surface of pillar structure and method for coating outer peripheral surface of pillar structure Download PDF

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US7981476B2
US7981476B2 US10/531,577 US53157705A US7981476B2 US 7981476 B2 US7981476 B2 US 7981476B2 US 53157705 A US53157705 A US 53157705A US 7981476 B2 US7981476 B2 US 7981476B2
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coating
pillar structure
outer peripheral
peripheral surface
elastic body
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US20050249877A1 (en
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Takashi Noro
Takahisa Kaneko
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NGK Insulators Ltd
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NGK Insulators Ltd
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Assigned to NGK INSULATORS, LTD. reassignment NGK INSULATORS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANEKO, TAKAHISA, NORO, TAKASHI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/08—Spreading liquid or other fluent material by manipulating the work, e.g. tilting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0208—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0241—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to elongated work, e.g. wires, cables, tubes

Definitions

  • the present invention relates to an apparatus for coating the outer peripheral surface of a pillar structure and a method for coating the outer peripheral surface of a pillar structure. More particularly, it relates an apparatus for coating the outer peripheral surface of a pillar structure and a method for coating the outer peripheral surface of a pillar structure according to which an outer peripheral surface coating free from defects can be formed by inhibiting occurrence of partial uncoating and peeling of the coating during coating of the outer peripheral surface of a pillar structure and formation of cracks during drying.
  • the inventors proposed an apparatus for coating the outer peripheral surface of a columnar body (pillar structure) (JP-A-8-323727).
  • This apparatus is characterized by being provided with a first pallet holding the columnar body, a mechanism rotating on the central axis of the first pallet and a smoothing plate provided with a given clearance from the outer periphery of the columnar body.
  • a coating material is coated on the rotating columnar body disposed on the first pallet by the smoothing plate, and a coated columnar body high in dimensional accuracy can be obtained in a short time as compared with hand-coating.
  • this outer peripheral surface coating apparatus there are problems when the clearance between the outer peripheral surface of the columnar body and the smoothing plate becomes irregular owing to slanting of the columnar body or the like.
  • the above-mentioned conventional apparatuses suffer from the problems that in case the clearance partially becomes too small or the outer periphery of the columnar body contacts with the smoothing plate due to the slanting of the columnar body, partial uncoating or peeling off of the coating is caused. Moreover, when the clearance between the outer periphery of the columnar body and the smoothing plate is made too large so that they do not contact with each other, the coating becomes too thick and hence cracks occur in the coating portion during drying.
  • the present invention has been made in view of the above problems, and the object of the present invention is to provide an apparatus for coating the outer peripheral surface of a pillar structure and a method for coating the outer peripheral surface of a pillar structure according to which occurrence of partial uncoating or peeling of the coating during coating of the outer peripheral surface of a pillar structure and occurrence of cracks during drying after coating are inhibited by thinly and uniformly coating the outer peripheral surface of the pillar structure with a coating material and then smoothing the coating surface, and, as a result, an outer peripheral surface coating free from defects can be formed.
  • the present invention provides the following apparatus for coating the outer peripheral surface of a pillar structure and method for coating the outer peripheral surface of a pillar structure.
  • An apparatus for coating the outer peripheral surface of a pillar structure which is provided with a holding means which holds the pillar structure in nearly vertical direction and rotates together with the held pillar structure on an axis of nearly vertical direction as a common rotating axis, a supplying and coating means which supplies a coating material to the outer peripheral surface of the rotating pillar structure and coats the coating material on the outer peripheral surface and a plate-like smoothing means the one longer side end portion of which is disposed at a given position with respect to the outer peripheral surface and which smoothes the coating surface of the coating material supplied to and coated on the outer peripheral surface, wherein the smoothing means has a smoothing plate and a sheet-like elastic body provided at the longer side end portion of the smoothing plate on the side of the pillar structure, the elastic body is disposed so that it contacts with the outer peripheral surface of the pillar structure, the coating material is supplied to and coated on the outer peripheral surface through the elastic body, and the coating surface is smoothed between the outer peripheral surface and the elastic body.
  • a method for coating the outer peripheral surface of a pillar structure using the apparatus for coating the outer peripheral surface of a pillar structure described in any one of the above [1]-[18] which comprises holding the pillar structure by the holding means, supplying the coating material from the supplying and coating means on the outer peripheral surface of the pillar structure and coating the coating material thereon while rotating the pillar structure and the holding means on the axis of nearly vertical direction as a common rotating axis, and smoothing the coating surface of the supplied and coated coating material between the outer peripheral surface and the sheet-like elastic body.
  • FIG. 1 is a front view which schematically shows one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention.
  • FIG. 2 is an enlarged oblique view which schematically shows a smoothing means and a supplying and coating means used in one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention.
  • FIG. 3 is a front view which shows one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention and schematically shows a state in which the supplying and coating means and the like are moved to the side of the pillar structure.
  • FIG. 4 is a sectional view which shows mutual positional relation of a smoothing means, a supplying and coating means and a following means used in one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention.
  • FIG. 5 is a sectional view which shows mutual positional relation of a smoothing means, a supplying and coating means and a following means used in one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention.
  • FIG. 6 is an oblique view which schematically shows one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention.
  • the smoothing means has a smoothing plate and a sheet-like elastic body, the elastic body is disposed in such a manner that it contacts with the outer peripheral surface of the pillar structure, and the coating surface of a coating material supplied to the outer peripheral surface of the pillar structure from the supplying and coating means and coated on the outer peripheral surface is smoothed between the outer peripheral surface and the elastic body, and, therefore, occurrence of partial uncoating or peeling of the coating can be inhibited, and furthermore since the coating material is thinly and uniformly coated, occurrence of cracks in the coating portion during drying after coating can be inhibited. As a result, a coating on the outer peripheral surface free from defects can be formed.
  • the method for coating the outer peripheral surface of a pillar structure according to the present invention comprises coating a coating material on the outer periphery of the pillar structure and smoothing the coating surface using the apparatus for coating the outer peripheral surface of a pillar structure of the present invention, and hence occurrence of partial uncoating or peeling of the coating can be inhibited, and furthermore since the coating material is thinly and uniformly coated, occurrence of cracks in the coating portion during drying after coating can be inhibited. As a result, a coating on the outer peripheral surface free from defects can be formed.
  • FIG. 1 is a front view which schematically shows one embodiment of the apparatus for coating the outer peripheral surface of a pillar structure according to the present invention.
  • a holding means 4 comprising a pedestal 3 and a cam 2 is fitted at around the central part of a frame 7 in such a manner that it can rotate on an axis of vertical direction as a rotating axis, and a smoothing means 10 and a supplying and coating means 12 are fitted together to a frame top part 7 a through a back and forth moving base 15 , an arm rotating part 16 and arms 17 and 18 .
  • the pedestal 3 constituting the holding means 4 is in the form of a disc and fitted to a frame bottom part 7 b in such a manner that it is vertically movable and its central axis is in vertical direction.
  • a pedestal motor 6 To the pedestal 3 is fitted a pedestal motor 6 through a shaft 6 a , and the pedestal 3 rotates on the central axis of the pedestal 3 as a rotation center.
  • the cam 2 constituting the holding means 4 is in the form of a thick disc (a cylindrical body low in height) and fitted to a frame top part 7 a in such a manner that it is vertically movable and its central axis nearly coincides with the central axis of the pedestal 3 .
  • a cam motor 5 through a shaft 5 a , and the cam 2 rotates on the central axis of the cam 2 as a rotation center.
  • the rotation of pedestal 3 and that of cam 2 are synchronous.
  • the pillar structure 1 is placed on the pedestal 3 with the central axis nearly coinciding with the central axis of the pedestal 3 (with one end 1 b facing downwardly), and the cam 2 is disposed on the side of another (upper) end 1 c , thereby to interpose (hold) the pillar structure 1 between the pedestal 3 and the cam 2 .
  • the thus held pillar structure 1 can rotate on the central axis as a common rotating axis (common to the central axis of cam 2 and that of the pedestal 3 ) simultaneously with synchronous rotation of pedestal 3 and cam 2 .
  • the cam 2 and the pedestal 3 are formed so that their outer peripheral shape is nearly the same as that of the pillar structure 1 .
  • the pillar structure 1 When the pillar structure 1 is to be placed on the pedestal 3 , the pillar structure 1 is placed on a transferring pallet 30 shown in FIG. 1 and FIG. 6 , and the transferring pallet 30 having the pillar structure 1 placed thereon is moved to the space above the pedestal 3 .
  • the transferring pallet 30 is rotated and moved by a swing motor 33 through a support shaft 31 and swing arm 32 .
  • an elevatable push-up plate 42 provided at the central portion of the pedestal 3 elevates to place the pillar structure 1 thereon, and after the transferring pallet 30 moves to the original position, the push-up plate 42 lowers and stays on the pedestal 3 (the upper surface of the pedestal 3 and the upper surface of the push-up plate 42 are positioned at the same plane).
  • the pillar structure 1 is disposed on the pedestal 3 , and by the centering plates 21 , 21 shown in FIG. 1 and FIG. 6 , the pillar structure 1 is positioned so that the central axis thereof nearly coincides with the central axis of cam 2 and that of pedestal 3 .
  • the two centering plates 21 , 21 are disposed on two rails 20 , 20 provided on nearly the same straight line.
  • the two centering plates 21 , 21 move on the rails 20 , 20 to the direction of the central axis of the cam 2 and the pedestal 3 and stop at the positions which are nearly equal in distance between the respective centering plates 21 , 21 and the central axis of the cam 2 and that of the pedestal 3 and at the positions at which the distance between the two centering plates 21 , 21 is nearly the same as the outer diameter of the pillar structure 1 , whereby the central axis of the pillar structure 1 is allowed to nearly coincide with the central axis of the cam 2 and that of the pedestal 3 .
  • the portion of the centering plate 21 which contacts with the outer peripheral surface 1 a preferably has a shape conforming to the shape of the outer peripheral surface 1 a , and, for example, in the case of cylindrical pillar structure, the portion preferably has a shape conforming to a circular arc as shown in FIG. 6 .
  • the upper end of the pillar structure 1 disposed on the pedestal 3 contacts with the cam 2 when the pedestal 3 is elevated along a pair of guide rails (not shown) and thus the pillar structure 1 is interposed between the cam 2 and the pedestal 3 (the cam 2 is disposed on the side of upper end of the pillar structure 1 ).
  • the pillar structure 1 is in the state of being held by the holding means 4 .
  • a nozzle 12 b having an opening in the form of a slit is formed at a supplying pipe 12 a in such a manner that the longer direction of the nozzle 12 b is along the longer direction of the supplying pipe 12 a , and a slit-shaped hole is formed at the supplying pipe 12 a so that the hole communicates with the opening (space portion) of the nozzle 12 b .
  • a piping 13 is connected to another end (upper end) of the supplying pipe 12 a for supplying the coating material.
  • the supplying and coating means 12 is disposed so that the opening of the nozzle 12 b faces the side of the pillar structure 1 and the central axis of the supplying pipe 12 a (the longer direction of the nozzle 12 b ) is in the direction of the central axis of the pillar structure 1 .
  • the piping 13 is connected to the upper portion of the supplying pipe 12 a , and the coating material supplied through the piping 13 is supplied to the outer peripheral surface 1 a of the pillar structure 1 from the opening of the nozzle 12 b through the supplying pipe 12 a and coated on the outer peripheral surface.
  • the smoothing means 10 is provided so that its longer direction coincides with the central axis of the pillar structure 1 .
  • the smoothing means 10 includes a smoothing plate 10 a and an elastic body 10 b , and the smoothing plate 10 a is a rectangular plate as shown in FIG. 1 , and the elastic body 10 b is a sheet-like elastic body worked into a form of strip and is disposed at the longer side end portion of the smoothing plate 10 a along the side of the pillar structure 1 .
  • the supplying and coating means 12 and the smoothing means 10 are formed integrally in such a manner that the direction of the nozzle 12 b of the supplying and coating means 12 is the same as the direction of the elastic body 10 b of the smoothing means 10 .
  • the supplying and coating means 12 and the smoothing means 10 which are formed integrally are disposed so that the nozzle 12 b and the elastic body 10 b face the side of the pillar structure 1 and are along the outer peripheral surface 1 a.
  • a nearly cylindrical following roller 14 as a following means is provided at the bottom of arm rotating part 16 and is formed in such a manner that it moves in nearly horizontal direction together with the supplying and coating means 12 and the smoothing means 10 through the arms 17 and 18 and the arm rotating part 16 .
  • the horizontal movement is carried out by nearly horizontal slide movement of the back and forth moving base 15 to which the arm rotating part 16 is fitted.
  • the following roller 14 is formed in such a manner that when it contacts with the cam 2 , it freely rotates by the force of rotation of the cam 2 while contacting with the cam 2 on the axis of vertical direction as a rotating center.
  • FIG. 3 shows the state when the elastic body 10 b of the smoothing means 10 contacts with the outer peripheral surface 1 a and the following roller 14 contacts with the outer peripheral surface of the cam 2 .
  • This state shows the state of FIG. 1 in which the supplying and coating means 12 , the smoothing means 10 , the following roller 14 and the back and forth moving base 15 which move together are moved to the side of the pillar structure 1 by the slide movement of the back and force moving base 15 for carrying out the coating of the outer peripheral surface 1 a .
  • the elastic body 10 b constituting the smoothing means 10 is provided so that it contacts with the outer peripheral surface 1 a of pillar structure 1 between both ends 1 b and 1 c , and as shown in FIG. 4 , the nozzle 12 b of supplying and coating means 12 is disposed at a given distance from the outer peripheral surface of pillar structure 1 with the opening of the nozzle 12 b of supplying and coating means 12 being directed toward the side of pillar structure 1 .
  • the coating material supplied through the piping 13 (see FIG.
  • the elastic body 10 b of the smoothing means 10 is disposed so as to contact with the outer peripheral surface 1 a of the pillar structure 1 , and the coating surface of the coating material supplied to the outer peripheral surface 1 a of the rotating pillar structure 1 from the nozzle 12 of the supplying and coating means 12 and coated thereon is smoothed between the outer peripheral surface 1 a and the elastic body 10 b , and as a result, partial uncoating or peeling of the coating can be inhibited.
  • the elastic body 10 b smoothes the coating surface of the coating material while contacting with the outer peripheral surface 1 a of the pillar structure 1 and can thinly and uniformly smooth the outer peripheral surface of the pillar structure 1 , and thus the coating portion can be inhibited from cracking at the time of drying after coating. Even when the pillar structure 1 is disposed at a slant, the elastic body 10 b can contact with the whole outer peripheral surface 1 a of the pillar structure 1 in the axial direction of the columnar body 1 , and hence the coating can also be inhibited from partial uncoating or peeling of the coating. Moreover, since the coating material can be thinly and uniformly coated, the coating portion can be inhibited from cracking at the time of drying after coating.
  • the following roller 14 used as a following means for moving the supplying and coating means 12 and the smoothing means 10 following the outer peripheral shape of the pillar structure 1 comprises a first following roller 14 a and a second following roller 14 b , which are positioned on nearly the same horizontal plane.
  • the two following rollers 14 are allowed to move in parallel in a given direction along the outer peripheral shape of the pillar structure 1 upon rotation of the pillar structure 1 while being slightly pressed against the outer peripheral surface of the cam 2 by the force of spring (not shown).
  • the distance between the supplying and coating means 12 and the smoothing means 10 and the outer peripheral surface 1 a of the pillar structure 1 can be kept constant (with respect to the elastic body 10 b , the state of contact between the elastic body 10 b and the outer peripheral surface 1 a can be kept constant).
  • the outer diameter of the pillar structure 1 is smaller than the outer diameter of the cam 2 and that of the pedestal 3 by the thickness of the coating to be applied onto the pillar structure 1 .
  • the thickness of the coating portion on the outer peripheral surface of the pillar structure can be adjusted. Furthermore, when the sectional shape of the pillar structure 1 cut along a plane perpendicular to the central axis of the pillar structure 1 is circle, the interval between the central axis of the first following roller 14 a and that of the second following roller 14 b is preferably 10-170% of a radius of the circle, and when the sectional shape is other than circle, which is “a shape (such as ellipse) having a perimeter of smooth curve (which may include a straight line)”, the interval is preferably 10-170% of the smallest radius of curvature.
  • the interval is less than 10%, since the movement of the following rollers 14 is not stable, the direction (angle) of the supplying and coating means 12 and the smoothing means 10 to the outer peripheral surface 1 a changes, and, hence, stable coating is sometimes hindered. If it is more than 170%, since the following means 14 is remote from the supplying and coating means 12 and the smoothing means 10 , unevenness of the portion of the outer peripheral surface 1 a with which the following means 14 contacts sometimes differs from that of the portion of the outer peripheral surface 1 a with which the smoothing means 10 contacts.
  • a third following roller 14 c and a fourth following roller 14 d which move together with the first following roller 14 a and the second following roller 14 b may be provided in such a manner as following the outer peripheral surface of the pedestal 3 .
  • angle A formed by a straight line passing the center of the following roller 14 a and that the following roller 14 b and the tip portion of the smoothing means 10 (elastic body 10 b ) is 20-60°. If the angle A is smaller than 20°, the force to remove excess coating material becomes smaller and the coating may become larger than the desired size, and if it is greater than 60°, the outer peripheral surface of the pillar structure is strongly pressed and the coating material may be scraped in an amount more than needed.
  • the angle A is an angle formed by “direction x” of a straight line passing the center of the following roller 14 a and that the following roller 14 b which directs to the rotation direction R of the pillar structure 1 and “direction y” of an extension line extending from the tip portion (elastic body 10 b ) of the smoothing means 10 toward the pillar structure 1 .
  • the material of the elastic body 10 b used in this embodiment is not particularly limited so long as when the elastic body 10 b contacts with the pillar structure 1 , it deforms with bending along the outer peripheral surface 1 a without damaging the outer peripheral surface 1 a and it can smooth the coat of the coating material, and, for example, there may be preferably used synthetic rubbers such as isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, urethane rubber and silicone rubber; natural rubbers; elastomers such as polyisobutylene and polyethylene; foamed materials such as foamed polyurethane, foamed polystyrene, foamed polyethylene, foamed polypropylene and sponge. Moreover, there may be used resins such as fluororesins, polyimide resins, polyamides and polyphenylene oxide.
  • the elastic body 10 b is in the form of a sheet, and the width thereof is preferably 1-10 mm. If it is less than 1 mm, the elastic body 10 b cannot sometimes cope with the change in clearance (distance) between the elastic body and the outer peripheral surface of the pillar structure, and if it is more than 10 mm, the coating material is scraped too much, resulting in considerable partial uncoating at the time of coating.
  • the thickness of the elastic body 10 b is preferably 1-5 mm.
  • the elastic body 10 b is preferably 30-80. If it is less than 30, the elastic body deforms too much and the coating surface of the coating material cannot sometimes be sufficiently smoothed, and if it is more than 80, the elastic body hardly deforms and hence it strongly presses the coating surface of the coating material and sometimes scrapes the coating material in an amount more than needed.
  • the width of the elastic body 10 b means the distance w (width of the elastic body) from the longer side end of the smoothing plate 10 a at which is provided the elastic body 10 b to the longer side end of the elastic body 10 b on the side of the pillar structure as shown in FIG. 2
  • the thickness of the elastic body is the thickness d (thickness of the elastic body) of the sheet which forms the elastic body as shown in FIG. 2
  • the hardness of the elastic body means the international rubber hardness (IRHD) measured in accordance with “test method on hardness of vulcanized rubber and thermoplastic rubber” of JIS K6253.
  • the material of the cam 2 , pedestal 3 and smoothing plate 10 is not particularly limited, and it is preferred that the outer surface thereof is stainless steel or wear-resistant ceramics.
  • the wear-resistant ceramics are preferably Si 3 N 4 , PZT, SiC or Al 2 O 3 .
  • the apparatus 50 for coating the outer peripheral surface of a pillar structure of this embodiment can be applied preferably to coating of the outer peripheral surface of the pillar structure 1 of which the section cut along a plane perpendicular to the central axis is circle or ellipse, and it can also be preferably applied to coating of the pillar structure having the shape of section other than circle or ellipse and having an outer peripheral surface comprising a smooth curved surface.
  • the apparatus 50 for coating the outer peripheral surface of a pillar structure of this embodiment can be preferably applied to coating of the pillar structure 1 which is a honeycomb structure comprising a plurality of cells which serve as flow paths of fluid.
  • Suitable examples of the material of the honeycomb structure are ceramics.
  • it can also be preferably applied in case when the honeycomb structure is held by the holding means 4 , the central axis slightly deviates (slants) from vertical direction.
  • the coating materials used in using the apparatus for coating the outer peripheral surface of a pillar structure of this embodiment are not particularly limited so long as they are suitable for coating the outer peripheral surface of the pillar structure, and there may be used, for example, paste-like coating materials containing inorganic fibers, inorganic binders, inorganic particles, organic binders, or the like.
  • the inorganic fibers include, for example, ceramic fibers such as silica alumina, mullite, alumina and silica.
  • the inorganic binders include, for example, silica sol, alumina sol and the like.
  • the inorganic particles include, for example, powdered silicon carbide, powdered silicon nitride, powdered boron nitride, and whiskers.
  • the organic binders include, for example, polyvinyl alcohol, methylcellulose, ethylcellulose and carboxycellulose.
  • the coating materials contain solvents such as water, acetone and alcohol, in addition to the inorganic fibers, inorganic binders, inorganic particles, organic binders, etc.
  • the viscosity of the paste-like coating materials is adjusted by these solvents to give the state suitable for coating on the outer peripheral surface of the pillar structure.
  • the viscosity of the coating material is preferably 15-50 Pa ⁇ s.
  • the thickness of the coating sometimes becomes too thin because of the low viscosity, and if it is higher than 50 Pa ⁇ s, it becomes difficult to coat thinly and uniformly on the outer peripheral surface because of the high viscosity.
  • the holding means 4 has the pedestal 3 , but does not have the cam 2 .
  • the pillar structure 1 is placed on the pedestal 3 in such a manner that its central axis nearly coincides with the central axis of the pedestal 3 , the elastic body 10 b of the smoothing means 10 is disposed so that it contacts with the outer peripheral surface 1 a of the pillar structure 1 , and the coating surface of the coating material supplied from the nozzle 12 of the supplying and coating means 12 and coated on the outer peripheral surface of the pillar structure 1 is smoothed between the outer peripheral surface 1 a and the elastic body 10 b .
  • the following rollers 14 used as a following means are two rollers of the third following roller 14 c and the fourth following roller 14 d which copy the outer periphery of the pedestal 3 since the holding means 4 does not have the cam 2 .
  • This embodiment is the same as the embodiment shown in FIG. 1 , except that the holding means 4 has the pedestal 3 , but does not have the cam 2 and the following means 14 comprises the two rollers of the third following roller 14 c and the fourth following roller 14 d which copy the outer periphery of the pedestal 3 .
  • the supplying and coating means 12 and the smoothing means 10 rotate together along the outer peripheral surface 1 a of the pillar structure 1 .
  • the coating material is supplied from the supplying and coating means 12 and coated, and the coating surface is smoothed by the smoothing means 10 while the supplying and coating means 12 , the smoothing means 10 and the following means 14 rotate together along the outer peripheral surface 1 a of the pillar structure 1 on the central axis of the pillar structure 1 as a rotation center.
  • This embodiment is the same as the embodiment shown in FIG. 1 , except that the supplying and coating means 12 , the smoothing means 10 and the following means 14 rotate together along the outer peripheral surface 1 a of the pillar structure 1 as a rotation center.
  • the method for coating the outer peripheral surface of a pillar structure is characterized in that using the apparatus 50 for coating the outer peripheral surface of a pillar structure described above (see FIG.
  • the pillar structure 1 is held by the holding means 4 , and while rotating the pillar structure 1 on an axis of nearly vertical direction as a common rotating axis, a coating material is supplied from the supplying and coating means 12 onto the outer peripheral surface 1 a of the pillar structure 1 and is coated on the outer peripheral surface 1 a , and the coating surface of the supplied and coated coating material is smoothed between the outer peripheral surface 1 a and the elastic body 10 b (the coating surface is smoothed by the elastic body 10 b ).
  • the pillar structure 1 is placed on the transferring pallet 30 shown in FIG. 1 and FIG. 6 , and the transferring pallet 30 is moved to the space above the pedestal 3 . Thereafter, the push-up plate 42 which can elevate and is provided at the central portion of the pedestal 3 (see FIG. 6 ) is elevated to place the pillar structure 1 thereon, and after the transferring pallet 30 is moved to the original position, the push-up plate 42 is lowered and allowed to stay in the pedestal 3 (namely, the upper surface of the pedestal 3 and the upper surface of the push-up plate 42 are positioned at the same plane), thereby disposing the pillar structure 1 on the pedestal 3 , and by using the centering plates 21 , 21 shown in FIG. 1 and FIG. 6 , the pillar structure 1 is positioned so that the central axis thereof nearly coincides with the central axis of the cam 2 and that of the pedestal 3 .
  • the upper end of the pillar structure 1 placed on the pedestal 3 is allowed to contact with the cam 2 by elevating the pedestal 3 , and the pillar structure 1 is interposed between the cam 2 and the pedestal 3 (the cam 2 is positioned on the side of the upper end of the pillar structure 1 ).
  • the pillar structure 1 is in the state of being held by the holding means 4 .
  • a slurry-like coating material is fed to a tank 41 shown in FIG. 6 .
  • the supplying and coating means 12 , the smoothing means 10 and the following means 14 are moved so that the elastic body 10 b of the smoothing means 10 contacts with the outer peripheral surface 1 a of the pillar structure 1 and the following means 14 contacts with the outer peripheral surface of the cam 2 as shown in FIG. 3 (namely, transfer the state of FIG. 1 to the state of FIG. 3 ).
  • the upper end portion of the elastic body 10 b is allowed to contact with the outer peripheral surface of the cam 2 and the lower end portion of the elastic body 10 b is allowed to contact with the outer peripheral surface of the pedestal 3 , thereby to inhibit omission of coating at the upper end 1 c and the lower end 1 b of the outer peripheral surface 1 a of the pillar structure 1 (to inhibit occurrence of uncoated portions).
  • a motor 5 for the cam and a motor 6 for the pedestal are started to rotate the cam 2 , the pedestal 3 and the pillar structure 1 at a given number of rotation.
  • the coating material is sent to a supply pipe 12 a through a piping 13 by a coating material supplying pump (not shown) and is supplied to the outer peripheral surface 1 a of the pillar structure 1 from the opening of the nozzle 12 b and coated on the outer peripheral surface 1 a .
  • the coating surface of the coating material coated on the outer peripheral surface 1 a of the pillar structure 1 is smoothed by the elastic body 10 b of the smoothing means 10 to complete the coating of the outer peripheral surface 1 a of the pillar structure 1 .
  • the coating surface of the coating material supplied from the nozzle 12 b of the supplying and coating means 12 and coated on the outer peripheral surface 1 a of the pillar structure 1 is smoothed between the outer peripheral surface 1 a and the elastic body 10 b and hence partial uncoating or peeling of the coating is inhibited. Furthermore, since the coating on the outer peripheral surface 1 a of the pillar structure 1 can be made thin and uniform by smoothing the coating surface of the coating material under contacting of the elastic body 10 b with the outer peripheral surface 1 a of the pillar structure 1 , the coating portion is inhibited from cracking during drying after coating.
  • the elastic body 10 b can also be allowed to contact with the whole of the outer peripheral surface 1 a of the pillar structure 1 in the axial direction, and hence partial uncoating or peeling of the coating is inhibited, and, furthermore, since the coating material can be coated thinly and uniformly, the coating portion is inhibited from cracking during drying after coating.
  • the outer peripheral surface of a pillar structure was coated as shown below using the apparatus for coating the outer peripheral surface of a pillar structure shown in FIG. 1 .
  • the pillar structure used was a cylindrical honeycomb structure comprising a plurality of cells which are flow paths for fluid.
  • the material of the structure was cordierite, and the outer peripheral surface was subjected to grinding to obtain the structure having an outer diameter of 143 mm and a height of 150 mm in central axis direction with a rib thickness of 0.175 mm and a cell density of 400 cells/(inch) 2 .
  • the diameter of a section (diameter of circle) perpendicular to the central axis of the cam 2 and the pedestal 3 was nearly the same as the diameter of a section (diameter of circle) perpendicular to the central axis of the honeycomb structure.
  • the slurry-like coating material used comprised 75% by mass of a coating cement (SiO 2 : 60.0, Al 2 O 3 : 39.2, Na 2 O: 0.4, MgO: 0.3 and other inorganic materials: 0.1 with an anti-freeze) and 25% by mass of cordierite powder (average particle diameter 2 ⁇ m) and had a viscosity of 20 Pa ⁇ s.
  • a coating cement SiO 2 : 60.0, Al 2 O 3 : 39.2, Na 2 O: 0.4, MgO: 0.3 and other inorganic materials: 0.1 with an anti-freeze
  • cordierite powder average particle diameter 2 ⁇ m
  • the pillar structure (honeycomb structure) 1 was placed on the transferring pallet 30 shown in FIG. 1 and the transferring pallet 30 was moved to the space above the pedestal 3 . Thereafter, the push-up plate 42 which can be elevated and was provided at the central portion of the pedestal 3 (see FIG. 6 ) was elevated to place thereon the pillar structure (honeycomb structure) 1 , and after the transferring pallet 30 was moved to the original position, the push-up plate 42 was lowered to dispose the pillar structure (honeycomb structure) 1 on the pedestal 3 . By using the centering plates 21 , 21 shown in FIG. 1 , the pillar structure (honeycomb structure) 1 was positioned so that the central axis thereof nearly coincided with the central axis of cam 2 and that of pedestal 3 .
  • the upper end of the pillar structure (honeycomb structure) 1 placed on the pedestal 3 was allowed to contact with the cam 2 by elevating the pedestal 3 , and the pillar structure (honeycomb structure) 1 was interposed between the cam 2 and the pedestal 3 .
  • the pillar structure (honeycomb structure) 1 was in the state of being held by the holding means 4 .
  • a slurry-like coating material was fed to the tank 41 shown in FIG. 6 .
  • the supplying and coating means 12 , the smoothing means 10 and the following means 14 were moved so that the elastic body 10 b of the smoothing means 10 contacted with the outer peripheral surface 1 a of the pillar structure (honeycomb structure) 1 and the following means 14 contacted with the outer peripheral surface of the cam 2 as shown in FIG. 3 (namely, transfer to the state of FIG. 3 from the state of FIG. 1 ).
  • the distance between the end portion of the smoothing plate 10 a on the side of the pillar structure (honeycomb structure) 1 and the outer peripheral surface 1 a of the pillar structure (honeycomb structure) 1 was 0.5 mm.
  • the elastic body 10 b As the elastic body 10 b , a sheet-like rubber (isoprene rubber) was used. Furthermore, the angle A (formed by a straight line passing the center of the following roller 14 a and that the following roller 14 b (direction x) and an extension line of the tip portion of the smoothing means 10 (elastic body 10 b ) (direction y)) shown in FIG. 5 was 45°. In this state, the coating material was sent to the supply pipe 12 a through the piping 13 by a coating material supplying pump (not shown) and was supplied to the outer peripheral surface 1 a of the pillar structure (honeycomb structure) 1 from the opening of the nozzle 12 b and coated on the outer peripheral surface 1 a .
  • a coating material supplying pump not shown
  • the coating surface of the coating material coated on the outer peripheral surface 1 a of the pillar structure (honeycomb structure) 1 was smoothed by the elastic body 10 b (rubber) of the smoothing means 10 to complete the coating of the outer peripheral surface 1 a of the pillar structure (honeycomb structure) 1 .
  • the cam 2 and the pedestal 3 were rotated (on their own axis) three times at the number of rotation of 10 rpm during the supplying and coating, and, thereafter, rotated (on their own axis) one time at 10 rpm.
  • the state of external appearance is shown by the results of overall evaluation conducted on both the degree of partial uncoating and the degree of peeling of the coating, and when the total area of the partial uncoating portion and the peeling portion was 10% or less of the outer peripheral surface (area), this result is indicated by “ ⁇ ”; when the total area was more than 10% and 20% or less of the outer peripheral surface (area), this result is indicated by “ ⁇ ”; and when the total area was more than 20% of the outer peripheral surface (area), this result is indicated by “X”.
  • the term “partial uncoating” means such a state that the coating was thin and the outer peripheral surface of the pillar structure (honeycomb structure) 1 was exposed
  • the term “peeling” means such a state that the coating peeled off.
  • the width of the elastic body means the distance w (width) between the longer side end of the smoothing plate 10 a at which the elastic body 10 b was provided and the longer side end of the elastic body 10 b on the side facing the pillar structure 1 in FIG. 2 .
  • the thickness of the elastic body means the thickness d of the sheet as the elastic body in FIG. 2 .
  • the hardness of the elastic body is measured by a measuring method based on “test method on hardness of vulcanized rubber and thermoplastic rubber” of JIS K6253. The results are shown in Table 1.
  • the thickness of the coating on the outer peripheral surface of the pillar structure (honeycomb structure) 1 obtained in Examples 1-14 and Comparative Example 1 was measured.
  • the thickness of the coating here is defined as follows.
  • the diameter of the pillar structure after coating and the diameter of the pillar structure before coating are measured, and the thickness of the coating is defined to be 1 ⁇ 2 of the value obtained by subtracting the diameter of the pillar structure before coating from the diameter of the pillar structure after coating.
  • the diameter of the pillar structure is the average value of the diameters at both ends and the central portion in the axial direction of the pillar structure. The results are shown in Table 1.
  • Example 1 1 3 50 ⁇ ⁇ 0.3 Example 2 2 3 50 ⁇ ⁇ 0.3 Example 3 3 3 50 ⁇ ⁇ 0.3 Example 4 5 3 50 ⁇ ⁇ 0.3 Example 5 10 3 50 ⁇ ⁇ 0.3 Example 6 15 3 50 ⁇ ⁇ 0.1 Example 7 20 3 50 ⁇ ⁇ 0.1 Example 8 3 1 50 ⁇ ⁇ 0.3 Example 9 3 5 50 ⁇ ⁇ 0.3 Example 10 3 8 50 ⁇ ⁇ 0.2 Example 11 3 10 50 ⁇ ⁇ 0.1 Example 12 3 3 3 30 ⁇ ⁇ 0.3 Example 13 3 3 80 ⁇ ⁇ 0.3 Example 14 3 3 100 ⁇ ⁇ 0.1 Comparative — — — X 0.7 Example 1
  • the thickness of the coating became thinner and the problems such as partial uncoating and peeling of the coating and occurrence of cracking were inhibited as compared with when a smoothing means of stainless steel was used. Moreover, from the fact that the partial uncoating was inhibited in spite of the thin thickness of the coating, it can be seen that the coating was more uniformly performed. Furthermore, the width of the elastic body was preferably 1-10 mm, the thickness of the elastic body was preferably 1-5 mm, and the hardness of the elastic body was preferably 30-80. By using an elastic body meeting these conditions, the outer peripheral surface of the pillar structure (honeycomb structure) can be more thinly and uniformly coated with inhibiting occurrence of partial uncoating, peeling and cracking.
  • the smoothing means has a smoothing plate and a sheet-like elastic body, the elastic body is disposed in such a manner that it contacts with the outer peripheral surface of the pillar structure, and the coating surface of a coating material supplied to the outer peripheral surface of the pillar structure from the supplying and coating means and coated on the outer peripheral surface is smoothed between the outer peripheral surface and the elastic body, and, therefore, occurrence of partial uncoating or peeling off of the coating can be inhibited, and, furthermore, since the coating material is thinly and uniformly coated, occurrence of cracks in the coating portion during drying after coating can be inhibited.
  • the method for coating the outer peripheral surface of a pillar structure according to the present invention comprises coating a coating material on the outer periphery of the pillar structure and smoothing the coating surface using the apparatus for coating the outer peripheral surface of a pillar structure of the present invention, and hence occurrence of partial uncoating or peeling off of the coating can be inhibited, and furthermore since the coating material is thinly and uniformly coated, occurrence of cracks in the coating portion during drying after coating can be inhibited. As a result, a coating on the outer peripheral surface free from defects can be formed.

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  • Application Of Or Painting With Fluid Materials (AREA)
US10/531,577 2002-10-22 2003-10-21 Apparatus for coating outer peripheral surface of pillar structure and method for coating outer peripheral surface of pillar structure Active 2026-11-09 US7981476B2 (en)

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JP2002306708A JP4413485B2 (ja) 2002-10-22 2002-10-22 柱状構造体の外周面コーティング装置及び柱状構造体の外周面コーティング方法
PCT/JP2003/013431 WO2004037441A1 (ja) 2002-10-22 2003-10-21 柱状構造体の外周面コーティング装置及び柱状構造体の外周面コーティング方法

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US20220288811A1 (en) * 2021-03-09 2022-09-15 Ngk Insulators, Ltd. Method and device for producing honeycomb structure

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JP5108215B2 (ja) * 2005-08-19 2012-12-26 日本碍子株式会社 柱状構造体の位置決め方法及び装置
JP5084517B2 (ja) * 2007-01-26 2012-11-28 イビデン株式会社 外周層形成装置
US9089992B2 (en) * 2007-04-30 2015-07-28 Corning Incorporated Methods and apparatus for making honeycomb structures with chamfered after-applied akin and honeycomb structures produced thereby
CN101980792B (zh) 2008-02-29 2013-09-04 康宁股份有限公司 用于使支承件相对于蜂窝状本体对准的方法和装置
FR2929548B1 (fr) * 2008-04-02 2010-04-23 Michelin Soc Tech Buse comprenant une palette d'applique articulee.
US8617659B2 (en) * 2008-08-29 2013-12-31 Corning Incorporated Methods of applying a layer to a honeycomb body
US20110126973A1 (en) * 2009-11-30 2011-06-02 Andrewlavage Jr Edward Francis Apparatus And Method For Manufacturing A Honeycomb Article
JP5717699B2 (ja) * 2012-08-08 2015-05-13 イビデン株式会社 ハニカム構造体の製造方法
JP5620447B2 (ja) * 2012-09-25 2014-11-05 日本碍子株式会社 ハニカム構造体の外周塗工方法

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US12434405B2 (en) * 2021-03-09 2025-10-07 Ngk Insulators, Ltd. Method and device for producing honeycomb structure

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AU2003301655A1 (en) 2004-05-13
WO2004037441A1 (ja) 2004-05-06
PL375707A1 (pl) 2005-12-12
PL206521B1 (pl) 2010-08-31
JP2004141708A (ja) 2004-05-20
KR20050055778A (ko) 2005-06-13
KR100676440B1 (ko) 2007-02-02
EP1567285A1 (de) 2005-08-31
EP1567285A9 (en) 2007-08-15
EP1567285B1 (en) 2009-12-09
DE60330497D1 (de) 2010-01-21
JP4413485B2 (ja) 2010-02-10
EP1567285A4 (en) 2007-12-12

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